Walk through the emergency service door to begin your ascent of TYM. Successfully hack the door that will leader you deeper into the facility. After you walk through the door you'll have an opportunity to complete a secondary objective detailed below.

An explosion has damaged an employee's mask and he will soon die from exposure unless you are able to hack a door and turn off the gas valve in time. Run to the edge of the hallway, take cover, and spot the guard on patrol. Quickly take him out.

Make your way down the corridor until you see the room with the valve controls. Next to this room is a security panel that you must hack if you want to get into the room. Once you open the door you have to quickly make your way to the valve control room or you'll be killed by exposure to the gas. Quickly turn the valve to shut off the gas, saving the employee's life.

Now that you've shut down the gas, explore the lockers to find the Pocket Secretary that contains the access codes to a variety of areas throughout the facility. Also, speak to the scientist who is resting in the room (move the boxes out of the way to make your way to him). The only thing this accomplishes is that guard we took out a minute ago, he'll leave you alone. Otherwise this is just a little bit of extra XP.

Continue onward to the control room just ahead past the two scientists who don't care about your presence here. The main thing in this room is the Maintenance Catwalk controls. Hack or enter the code (5720) to move the catwalk.

If you move the catwalk to its furthest position it will allow you to climb the nearby ladder and cross this catwalk into a storage room with some loot and an air vent. If you use the air vent you must have the Icarus Landing System because the vent will lead you to a tall chamber -- the fall will kill you if you don't have this Augmentation.

Moving the catwalk to its near position it will lead you to another storage room for some loot and a Pocket Secretary to obtain the password to the Pump Room (7934).

When you're done looting the rooms from the catwalk, leave this chamber and go down the stairs that lead out of this room, and continue down the yellow staircase to the ground floor.

As you approach the corner go into cover and spot the security camera. Sneak up to the power generator next to the camera when it's looking away and go back into cover, overlooking the catwalk.

Besides avoiding detection from the camera there is a robot on patrol on the other side of this catwalk. It will remain on the other side of the catwalk during its patrol. Wait for it to look away from the catwalk before moving to the other side of the facility and taking cover behind another power generator underneath a security camera.

Because we had upgraded our strength augmentation earlier in the game it allows us sneak away from the robot's patrol route towards the supply shelf. Near this shelf is a large container under a "Do Not Steal" sign -- move this container to reveal an air vent. Crawl through this vent.

Drop out of the vent and take cover by the door, allowing you to observe the two guards in this room -- one will remain standing while the other guard continues to come and go. You will have to take both of these guards out quickly before the patrol robot notices. For us, we used the tranquilizer rifle to shoot one guard in the back and immediately after we knocked out the adjacent guard, having both of them collapse at the same time. Once they're suppressed be sure to move their bodies away from the doorway to reduce the chance of the robot noticing.

Once the robot passing by the room on patrol, leave this room and hide under the security camera near the power generator. Once the robot moves away on its patrol, quickly move to the exit and up the stairs.

Once at the top of the stairs go into cover by the corner of the hallway and suppress the guard on patrol. You can enter the Pump Room (7934) at the end of the hall to pick up some ammo and credits. Continue down to the other side of the hallway, walk through the door, and activate the elevator.

As you exit from the elevator enter the unlocked cage to your left to pick up some loot. Continue through the door while avoiding the electric water puddle and spot the vent on the floor behind the red container. Crawl through this vent to appear in a small caged room. Flip the nearby switch to turn off the electricity. Backtrack to the previous area.

Crawl under the scaffolding and grab one of the boxes. Carry it back out and place it next to the ladder. Jump on top of the box, then jump up to the scaffolding. Repeat this task as you continue to climb to higher platforms, eventually making your way to the catwalk. Once here, climb the ladder and enter the elevator.

As you exit from the elevator make sure you holster your weapon so you don't draw unneeded attention to yourself. Follow the walkway along the perimeter (follow the line on the ground) until you come to a storage room across from a door labeled restrictive area.

Next to the red crates are some containers and two small boxes that are blocking an air vent. Remove these boxes and jump on top of the crates, make your way into the air vent, and follow it through into the nearby lab.

Exit from the vent and stay crouched. On the small table next to the silver helmets is an Access Card. Backtrack out of this area through the vent. Now you can approach the guard at the entrance to the labratory and present to him this access card for easy entry into the facility.

At this point you can freely move about the lab as long as you keep your distance from the guards and keep your weapon holstered. This is a good time for you to pick up any loot in the area, including a Praxis Kit in a desk drawer in one of the medical offices upstairs (pictured above). At this point we maxed out our Energy Level Augmentations for our character.

Continue to move through the rest of the upstairs area of the lab and make your way to the Data Core room. You can still move freely through this area until you eventually want to gain entry to the Data Core room itself. If you have the Pheromone Augmentation you'll be able to sweet talk your way past the guard into this area. Otherwise, you're going to have to be sneaky.

Nearby you'll see a laser field that is occasionally patrolled by a single guard. Next to this field is a console that is easy to hack, allowing you to disable the laser field. Once it's down, sneak up behind this guard and suppress him. Continue down the walkway and get into cover. Use a ranged weapon, like a tranquilizer rifle or silent sniper rifle to take out the guard on patrol at the far end of this walkway without alerting anyone nearby.

Halfway down the walkway is a set of stairs that leads to the Data Core room, patrolled by a single guard. Suppress this guard to obtain the Pocket Secretary on his body that contains the code for entering the Data Core room (0703). Enter this code at the door to enter this room.

As you enter this room you'll see it is guarded by a number of lasers that have an obvious scanning pattern. Hiding behind boxes or walls will keep you hidden from these lasers. Move from cover to cover while avoiding detection and make your way for a small room guarded by two lasers, one of which has a power fluxuation -- time it so you crawl under the solid laser into this room.

Move the box out of the way to reveal an air vent. Follow the vent that leads to a small security office. Quietly suppress the guards, starting with the guard nearest you in the chair. Successfully hack the Security Hub at the guard's desk -- if you upgraded your hacking ability earlier, you'll be able to have the patrol robot eliminate any remaining guards in this area.

There's also a dedicated terminal in this room that if you can successfully hack it, will allow you to turn off the remaining security lasers giving you a clear path to the Data Core room; be sure to avoid detection from the camera. Walking in this room will start a cut-scene after which your objective will be updated to confront Zhao in the Penthouse, continued in the next chapter of this guide.